Lyric discussion by DCShannon 

Cover art for Lunatic To Love lyrics by Presidents of the United States of America, The

This song works just fine taken literally.

He's got a girl with mental health problems. Sounds like it could be paranoid schizophrenia (one half of the brain is spying on the other half, driving her insane). But they love each other, and it's enough that she says she's happy, which is all that matters to him.

I've tried forming a relationship with a girl with schizoid problems, and getting that to work out is definitely something to sing about, because it ain't easy.